Entitled: "Different ways of looking through the viewfinder of portable cameras." A box camera is a simple type of camera, the most common form being a cardboard or plastic box with a lens in one end and film at the other. They were very popular in the late 19th and early 20th centuries. Because of the inability to adjust focus, the small lens aperture and the low sensitivity of the sensitive materials available, these cameras work best in brightly lit day-lit scenes when the subject is within the hyperfocal distance for the lens and of subjects that move little during the exposure. In photography, a viewfinder is what the photographer looks through to compose, and, in many cases, to focus the picture. Most viewfinders are separate, and suffer parallax, while the single-lens reflex camera lets the viewfinder use the main optical system. Illustration appeared in "Manuel pratique du Reporter Photographe", 1903.